Sangay volcano (Ecuador): the opening of two new vents, a drumbeat seismic sequence and a new lava flow in late 2021

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Silvana Hidalgo
https://orcid.org/0000-0001-6386-9502
Francisco Javier Vasconez
https://orcid.org/0000-0003-2000-1636
Jean Battaglia
https://orcid.org/0000-0002-9513-1200
Benjamin Bernard
https://orcid.org/0000-0002-0333-5493
Pedro Espín
https://orcid.org/0000-0003-1945-8110
Sébastien Valade
https://orcid.org/0000-0002-6687-7302
María-Fernanda Naranjo
https://orcid.org/0000-0003-2555-7983
Robin Campion
https://orcid.org/0000-0003-1638-8479
Josué Salgado
https://orcid.org/0000-0002-9584-0656
Marco Córdova
https://orcid.org/0000-0002-1038-1041
Marco Almeida
https://orcid.org/0000-0002-6694-8916
Stephen Hernández
https://orcid.org/0000-0002-8990-4027
Gerardo Pino
https://orcid.org/0000-0002-7483-6666
Elizabeth Gaunt
https://orcid.org/0000-0002-1787-2062
Andrew Bell
https://orcid.org/0000-0002-5633-6289
Patricia Mothes
https://orcid.org/0000-0002-0650-5531
Mario Ruiz
https://orcid.org/0000-0002-0872-6573

Abstract





On 2 December, 2021 we recorded a sequence of drumbeat seismic events at Sangay volcano. This sequence lasted several hours and resulted in two explosive emissions whose eruptive columns reached 9 km above crater. Unexpectedly, these explosions did not produce any ash fallout in the inhabited areas around the volcano. This drumbeat sequence was produced after a series of morphological changes, including the opening of two new vents (W and N) and a landslide. These occurred during an enhanced period of ground deformation and degassing. Further analysis of satellite images allowed us to determine that this sequence was associated with the widening of the recently open vent north of the main crater, and the extrusion of a new lava flow. Timely communication of this event to the authorities and the population was ensured by the IG-EPN by following internal protocols. The corresponding short reports reached more than 300,000 people.





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How to Cite
Hidalgo, S., Vasconez, F. J., Battaglia, J., Bernard, B., Espín, P., Valade, S., Naranjo, M.-F., Campion, R., Salgado, J., Córdova, M., Almeida, M., Hernández, S., Pino, G., Gaunt, E., Bell, A., Mothes, P. and Ruiz, M. (2022) “Sangay volcano (Ecuador): the opening of two new vents, a drumbeat seismic sequence and a new lava flow in late 2021”, Volcanica, 5(2), pp. 295–311. doi: 10.30909/vol.05.02.295311.
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